Functions to estimate the density and size of a spatially 
  distributed animal population sampled with an array of passive detectors, 
  such as traps, or by searching polygons or transects. Models incorporating 
  distance-dependent detection are fitted by maximizing the likelihood. 
  Tools are included for data manipulation and model selection.

Tools for designing spatially explicit capture-recapture studies of animal populations. This is primarily a simulation manager for package 'secr'. Extensions in version 2.5.0 include costing and evaluation of detector spacing.

Allow sharing sensitive information, for example passwords,
    'API' keys, etc., in R packages, using public key cryptography.

Fast and memory-efficient streaming hash functions. Performs direct
    hashing of strings, raw bytes, and files potentially larger than memory, as
    well as hashing in-memory objects through R's serialization mechanism,
    without requiring allocation of the serialized object. Implementations
    include the SHA-256, SHA-3 and 'Keccak' cryptographic hash functions,
    SHAKE256 extendable-output function (XOF), and 'SipHash' pseudo-random
    function. The SHA-3 Secure Hash Standard was published by the National
    Institute of Standards and Technology (NIST) in 2015 at
    <doi:10.6028/NIST.FIPS.202>. The SHA-256 Secure Hash Standard was published
    by NIST in 2002 at
    <https://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf>.

Encrypt text using a simple shifting substitution cipher with setcode(), providing two numeric keys used to define the encryption algorithm. The resulting text can be decoded using decode() function and the two numeric keys specified during encryption.

Tools for spatially explicit capture-recapture analysis of animal populations in linear habitats, extending package 'secr'.

Simultaneously infers state-dependent diversification across
 two or more states of a single or multiple traits while accounting for the
 role of a possible concealed trait. See Herrera-Alsina et al. (2019)
 <doi:10.1093/sysbio/syy057>.