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2. ### 555 (telephone number) - Wikipedia

en.wikipedia.org/wiki/555_(telephone_number)

This led to the video game The Last of Us accidentally including the number to a phone-sex operator in the game.  The number "555-2368" (or 311-555-2368) is a carryover from the "EXchange 2368" ("Exchange CENTral") number common in telephone advertisements as early as the 1940s.

3. ### Stochastic process - Wikipedia

en.wikipedia.org/wiki/Stochastic_process

It can be defined as a counting process, which is a stochastic process that represents the random number of points or events up to some time. The number of points of the process that are located in the interval from zero to some given time is a Poisson random variable that depends on that time and some parameter.

4. ### Transaction authentication number - Wikipedia

en.wikipedia.org/wiki/Transaction_authentication...

A ChipTAN generator is not tied to a particular account; instead, the user must insert their bank card during use. The TAN generated is specific to the bank card as well as to the current transaction details. There are two variants: In the older variant, the transaction details (at least amount and account number) must be entered manually.

5. ### RSA SecurID - Wikipedia

en.wikipedia.org/wiki/RSA_SecurID

The RSA SecurID authentication mechanism consists of a "token"—either hardware (e.g. a key fob) or software (a soft token)—which is assigned to a computer user and which creates an authentication code at fixed intervals (usually 60 seconds) using a built-in clock and the card's factory-encoded almost random key (known as the "seed").

6. ### Poisson distribution - Wikipedia

en.wikipedia.org/wiki/Poisson_distribution

The number of such events that occur during a fixed time interval is, under the right circumstances, a random number with a Poisson distribution. The equation can be adapted if, instead of the average number of events λ {\displaystyle \lambda } , we are given a time rate for the number of events r {\displaystyle r} to happen.

7. ### Keygen - Wikipedia

en.wikipedia.org/wiki/Keygen

A key generator (key-gen) is a computer program that generates a product licensing key, such as a serial number, necessary to activate for use of a software application.

8. ### Blue box - Wikipedia

en.wikipedia.org/wiki/Blue_box

Using a toll-free number ensured that the phone being used for access would not be billed. When the call began to ring, the caller would hold the speaker over the microphone in the handset and use the blue box to send the 2600 Hz tone (or 2600+2400 Hz on many international trunks followed by a 2400 Hz tone).

9. ### Universally unique identifier - Wikipedia

en.wikipedia.org/wiki/Universally_unique_identifier

For example, the number of random version-4 UUIDs which need to be generated in order to have a 50% probability of at least one collision is 2.71 quintillion, computed as follows: n ≈ 1 2 + 1 4 + 2 × ln ⁡ ( 2 ) × 2 122 ≈ 2.71 × 10 18 . {\displaystyle n\approx {\frac {1}{2}}+{\sqrt {{\frac {1}{4}}+2\times \ln(2)\times 2^{122}}}\approx 2 ...